Variable-speed device.



W. E. MAIN.

VARIABLE SPEED DEVICE.

APPLICATION FILED JUNE 1, 1909.

939,427. v Patented Nov. 9, 1909.

To all whom it may concern:

WILLIAM 1. MAIN, or SALT LAKE CITY, UTAH,

VARIABLE-SPEED DEVICE.

Specification of Letters Patent.

Patented Nov. 9, 1909.

Application filed June 1, 1909.' Serial No. 499,589.

Be it known that I, WILLIAM F. MA-IN, a

' citizen of the United States,residing at Salt Lake City, in the countyof Salt Lake and State of Utah, have invented certain new and usefulImprovements-in Variable-Speed Devices, of which the following is aspecification.

The purpose of my invention is to proreference indicate like partsthroughout the several figures.

Figure 1 is an elevation, one quarter in section, on line 00 a: Fig. 2.Fig. 2 is a side elevation.

On the driving shaft 1 is keyed one disk 2 of the pulley, which disk isprovided with an extended hub 3. The other disk 4 is slidably keyed tosaid hub 3 by the key 17, permitting independent lateral motion, but thesame rotary motion as the other disk and the shaft. Without detractingfrom the spirit of the invention the same result'may be accomplished byhaving disk 4 keyed to the shaft with an extended huband disk 2 slidablykeyed to it. The two disks are spaced a art by the s rings 5, thusforming an annu ar channel w ose sides are inclined outwardly. It is notmy intention to confine myself to the spiral spring as shown. Any formof spring may be used that will allow the disks to co-act in rotarymotion, and permit the widthef said annular channel to be changed.

An extension of the shaft 1, in the form of the nut 6, is threadablysecured thereon, on which is carried the sleeve 7, which sleeve 7 actsas a bearing for the cams 8 and 9. Between the cam 8 and the hub of thedisk 4 is fitted the ball bearings 10. The cam 8 has a lever or handle11 keyed thereon or formed integral therewith to operate and secure thecam 8 in the desired position.

The cam 9 is adapted to en age the other cam 8 on one side and has ba 1bearings 10 on the other side, and secured thereon-or formed integraltherewith is an operatmg lever 12. The lower end of said lever 12 isextended as'bearings 13 for the'belt tightener 14 The camsS and 9 arekept on sa1d sleeve 7 by the cap nut 16 which also retains the ballbearing 10 in contact with the cam 9.

- An endless belt 15 has its edges cut on the same angle as the sides ofthe disks 2 and 4 thus forming a friction cont-act with the edges ofsaid belt 15. This contact is changed by the adjustment of the disks 2and 4. The said belt 15 when made to move over another pulley (notshown) will engage by the. friction of its edges with the inner sides ofthe disks 2' and 4. The levers 11 and ,12, the lower portions of whichare shown Motion having been imparted to-the pulley and thereby to theshaft 1, and desiring to increase the speed of the shaft 1, the lever 12is moved in the direction of the arrow. This movement of the lever 12will rotate the cam 9 on said sleeve 7 The jaws of this cam will engagewith the jaws of the cam 8. The said cam 8 not being permitted to rotateby reason of the lever 11 being set, will move longitudinally on saidsleeve 7 and will likewise move the disk 4 longitudinally on its bearing3 and compress the springs 5. As the disk 2 cannot be movedlongitudinally on its shaft 1, the disks 2 and 4 will be pressed nearertogether, and the circle of contact of the edges of the belt 15 will beenlarged, and the travel of the belt increased. The said movement of thelever 12 will release the belt tightener 14; to decrease the travel ofthe belt 15, the lever 12 is moved in the opposite direction. This willdecrease the circle of contact of the edges of said belt 15, anddecrease the speed thereof, the tightener 14 will take up the slack. Thelever 11 .will permit the adjustment of the cams by adjusting cam 8.

Having thus described my invention I desire to secure by Letters Patentand claim:

1. In a device of the class described, the combination with a shaft, ofone disk of a pulley keyed thereto, the other disk of said pulleyslidably keyed to the hub of the first mentloned disk, a cam andanti-friction bearings between said cam and the last mentioned disk, acam adapted to engage with the first mentioned cam, a lever securedthereon whose lower end is extended, forming bearings for a belttightener, a belt tightener and a belt whose edges are cut to fitbetween said disks, as and for the pur: poses described.

2. In a device of the class described in combination, a shaft, a pulleyformed of two disks spaced and resiliently held apart a cam on saidshaft ball bearings between said cam and said pulley, another camadaptedto engage with the first mentioned cam, each of which cams isprovided with an operatin lever and a belt tightener secured to one 0%sad levers, as and for the purposes described.

3. Ina device of the class described in combination, a shaft, one diskof a pulley keyed thereon, the other disk of said pulley Slidably keyedto the hub of said first mentioned disk, a nut threadably secured on theend of said shaft a sleeve on said nut, cams on said sleeve, a lever oneachof said cams, a belt tightener secured to one of said levers and anendless belt whose edges are cut at the same angle as the flanges ofsaid disk, as and for the pur oses described.

In testimony W ereof- I have afiixed my signature in presence of twowitnesses.

. WILLIAM F. MAIN.

' Witnesses:

J. J. Commi, BEN L. CORUM.

